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From: Daniel Vetter <daniel@ffwll.ch>
To: "Christian König" <ckoenig.leichtzumerken@gmail.com>
Cc: linaro-mm-sig@lists.linaro.org, dri-devel@lists.freedesktop.org,
	linux-media@vger.kernel.org, intel-gfx@lists.freedesktop.org,
	daniel@ffwll.ch
Subject: Re: [PATCH 21/26] drm: use new iterator in drm_gem_plane_helper_prepare_fb v2
Date: Fri, 17 Sep 2021 16:55:49 +0200	[thread overview]
Message-ID: <YUSsdbTxvJwaRv9x@phenom.ffwll.local> (raw)
In-Reply-To: <20210917123513.1106-22-christian.koenig@amd.com>

On Fri, Sep 17, 2021 at 02:35:08PM +0200, Christian König wrote:
> Makes the handling a bit more complex, but avoids the use of
> dma_resv_get_excl_unlocked().
> 
> v2: add missing rcu_read_lock()/unlock()
> 
> Signed-off-by: Christian König <christian.koenig@amd.com>
> ---
>  drivers/gpu/drm/drm_gem_atomic_helper.c | 14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_gem_atomic_helper.c b/drivers/gpu/drm/drm_gem_atomic_helper.c
> index e570398abd78..d8f9c6432544 100644
> --- a/drivers/gpu/drm/drm_gem_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_gem_atomic_helper.c
> @@ -143,6 +143,7 @@
>   */
>  int drm_gem_plane_helper_prepare_fb(struct drm_plane *plane, struct drm_plane_state *state)
>  {
> +	struct dma_resv_iter cursor;
>  	struct drm_gem_object *obj;
>  	struct dma_fence *fence;
>  
> @@ -150,9 +151,18 @@ int drm_gem_plane_helper_prepare_fb(struct drm_plane *plane, struct drm_plane_st
>  		return 0;
>  
>  	obj = drm_gem_fb_get_obj(state->fb, 0);
> -	fence = dma_resv_get_excl_unlocked(obj->resv);
> -	drm_atomic_set_fence_for_plane(state, fence);
> +	rcu_read_lock();
> +	dma_resv_iter_begin(&cursor, obj->resv, false);
> +	dma_resv_for_each_fence_unlocked(&cursor, fence) {
> +		rcu_read_unlock();
> +		/* TODO: We only use the first write fence here */
> +		drm_atomic_set_fence_for_plane(state, fence);

Yeah I wonder whether we should/need to collate them all together. But I
guesss whomever hits that first with their funny multi-plane yuv or
whatever gets to do that. Or I'm not clear on what exactly your TODO here
means?

> +		return 0;
> +	}
> +	dma_resv_iter_end(&cursor);
> +	rcu_read_unlock();

Imo we should do full dma_resv_lock here. atomic helpers are designed to
allow this, and it simplifies things. Also it really doesn't matter for
atomic, we should be able to do 60fps*a few planes easily :-)
-Daniel

>  
> +	drm_atomic_set_fence_for_plane(state, NULL);
>  	return 0;
>  }
>  EXPORT_SYMBOL_GPL(drm_gem_plane_helper_prepare_fb);
> -- 
> 2.25.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

WARNING: multiple messages have this Message-ID
From: Daniel Vetter <daniel@ffwll.ch>
To: "Christian König" <ckoenig.leichtzumerken@gmail.com>
Cc: linaro-mm-sig@lists.linaro.org, dri-devel@lists.freedesktop.org,
	linux-media@vger.kernel.org, intel-gfx@lists.freedesktop.org,
	daniel@ffwll.ch
Subject: Re: [Intel-gfx] [PATCH 21/26] drm: use new iterator in drm_gem_plane_helper_prepare_fb v2
Date: Fri, 17 Sep 2021 16:55:49 +0200	[thread overview]
Message-ID: <YUSsdbTxvJwaRv9x@phenom.ffwll.local> (raw)
In-Reply-To: <20210917123513.1106-22-christian.koenig@amd.com>

On Fri, Sep 17, 2021 at 02:35:08PM +0200, Christian König wrote:
> Makes the handling a bit more complex, but avoids the use of
> dma_resv_get_excl_unlocked().
> 
> v2: add missing rcu_read_lock()/unlock()
> 
> Signed-off-by: Christian König <christian.koenig@amd.com>
> ---
>  drivers/gpu/drm/drm_gem_atomic_helper.c | 14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_gem_atomic_helper.c b/drivers/gpu/drm/drm_gem_atomic_helper.c
> index e570398abd78..d8f9c6432544 100644
> --- a/drivers/gpu/drm/drm_gem_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_gem_atomic_helper.c
> @@ -143,6 +143,7 @@
>   */
>  int drm_gem_plane_helper_prepare_fb(struct drm_plane *plane, struct drm_plane_state *state)
>  {
> +	struct dma_resv_iter cursor;
>  	struct drm_gem_object *obj;
>  	struct dma_fence *fence;
>  
> @@ -150,9 +151,18 @@ int drm_gem_plane_helper_prepare_fb(struct drm_plane *plane, struct drm_plane_st
>  		return 0;
>  
>  	obj = drm_gem_fb_get_obj(state->fb, 0);
> -	fence = dma_resv_get_excl_unlocked(obj->resv);
> -	drm_atomic_set_fence_for_plane(state, fence);
> +	rcu_read_lock();
> +	dma_resv_iter_begin(&cursor, obj->resv, false);
> +	dma_resv_for_each_fence_unlocked(&cursor, fence) {
> +		rcu_read_unlock();
> +		/* TODO: We only use the first write fence here */
> +		drm_atomic_set_fence_for_plane(state, fence);

Yeah I wonder whether we should/need to collate them all together. But I
guesss whomever hits that first with their funny multi-plane yuv or
whatever gets to do that. Or I'm not clear on what exactly your TODO here
means?

> +		return 0;
> +	}
> +	dma_resv_iter_end(&cursor);
> +	rcu_read_unlock();

Imo we should do full dma_resv_lock here. atomic helpers are designed to
allow this, and it simplifies things. Also it really doesn't matter for
atomic, we should be able to do 60fps*a few planes easily :-)
-Daniel

>  
> +	drm_atomic_set_fence_for_plane(state, NULL);
>  	return 0;
>  }
>  EXPORT_SYMBOL_GPL(drm_gem_plane_helper_prepare_fb);
> -- 
> 2.25.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

  reply	other threads:[~2021-09-17 14:55 UTC|newest]

Thread overview: 115+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-17 12:34 Deploying new iterator interface for dma-buf Christian König
2021-09-17 12:34 ` [Intel-gfx] " Christian König
2021-09-17 12:34 ` [PATCH 01/26] dma-buf: add dma_resv_for_each_fence_unlocked v2 Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 13:23   ` Daniel Vetter
2021-09-17 13:23     ` [Intel-gfx] " Daniel Vetter
2021-09-20  8:43     ` Tvrtko Ursulin
2021-09-20 10:09       ` Christian König
2021-09-20 10:26         ` Tvrtko Ursulin
2021-09-17 12:34 ` [PATCH 02/26] dma-buf: add dma_resv_for_each_fence Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 13:27   ` Daniel Vetter
2021-09-17 13:27     ` [Intel-gfx] " Daniel Vetter
2021-09-17 14:30     ` Daniel Vetter
2021-09-17 14:30       ` Daniel Vetter
2021-09-17 12:34 ` [PATCH 03/26] dma-buf: use new iterator in dma_resv_copy_fences Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 14:35   ` Daniel Vetter
2021-09-17 14:35     ` [Intel-gfx] " Daniel Vetter
2021-09-20  7:23     ` Christian König
2021-09-20  7:23       ` [Intel-gfx] " Christian König
2021-09-17 12:34 ` [PATCH 04/26] dma-buf: use new iterator in dma_resv_get_fences v2 Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 14:39   ` Daniel Vetter
2021-09-17 14:39     ` [Intel-gfx] " Daniel Vetter
2021-09-17 12:34 ` [PATCH 05/26] dma-buf: use new iterator in dma_resv_wait_timeout Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 14:43   ` Daniel Vetter
2021-09-17 14:43     ` [Intel-gfx] " Daniel Vetter
2021-09-20  7:27     ` Christian König
2021-09-20  7:27       ` [Intel-gfx] " Christian König
2021-09-17 12:34 ` [PATCH 06/26] dma-buf: use new iterator in dma_resv_test_signaled Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 14:45   ` Daniel Vetter
2021-09-17 14:45     ` [Intel-gfx] " Daniel Vetter
2021-09-17 12:34 ` [PATCH 07/26] drm/ttm: use the new iterator in ttm_bo_flush_all_fences Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 14:50   ` Daniel Vetter
2021-09-17 14:50     ` [Intel-gfx] " Daniel Vetter
2021-09-17 12:34 ` [PATCH 08/26] drm/amdgpu: use the new iterator in amdgpu_sync_resv Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 12:34 ` [PATCH 09/26] drm/amdgpu: use new iterator in amdgpu_ttm_bo_eviction_valuable Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 12:34 ` [PATCH 10/26] drm/msm: use new iterator in msm_gem_describe Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 12:34 ` [PATCH 11/26] drm/radeon: use new iterator in radeon_sync_resv Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 12:34 ` [PATCH 12/26] drm/scheduler: use new iterator in drm_sched_job_add_implicit_dependencies v2 Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 14:52   ` Daniel Vetter
2021-09-17 14:52     ` [Intel-gfx] " Daniel Vetter
2021-11-15 14:03   ` Sascha Hauer
2021-11-15 14:03     ` Sascha Hauer
2021-11-15 14:03     ` [Intel-gfx] " Sascha Hauer
2021-11-15 14:08     ` Daniel Vetter
2021-11-15 14:08       ` [Intel-gfx] " Daniel Vetter
2021-11-15 14:08       ` Daniel Vetter
2021-11-15 20:32       ` Christian König
2021-11-15 20:32         ` Christian König
2021-11-15 20:32         ` [Intel-gfx] " Christian König
2021-11-16  7:56       ` Sascha Hauer
2021-11-16  7:56         ` [Intel-gfx] " Sascha Hauer
2021-11-16  7:56         ` Sascha Hauer
2021-09-17 12:35 ` [PATCH 13/26] drm/i915: use the new iterator in i915_gem_busy_ioctl Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-20  8:45   ` Tvrtko Ursulin
2021-09-20 10:13     ` Christian König
2021-09-20 10:33       ` Tvrtko Ursulin
2021-09-21  9:41         ` Christian König
2021-09-21 13:10           ` Tvrtko Ursulin
2021-09-17 12:35 ` [PATCH 14/26] drm/i915: use the new iterator in i915_sw_fence_await_reservation v3 Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-20  8:45   ` Tvrtko Ursulin
2021-09-20  8:47     ` Tvrtko Ursulin
2021-09-20 10:14       ` Christian König
2021-09-17 12:35 ` [PATCH 15/26] drm/i915: use the new iterator in i915_request_await_object v2 Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-17 12:35 ` [PATCH 16/26] drm/i915: use new iterator in i915_gem_object_wait_reservation v2 Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-20 10:00   ` Tvrtko Ursulin
2021-09-21 17:35     ` Christian König
2021-09-17 12:35 ` [PATCH 17/26] drm/i915: use new iterator in i915_gem_object_wait_priority v2 Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-17 12:35 ` [PATCH 18/26] drm/i915: use new iterator in i915_gem_object_last_write_engine v2 Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-17 12:35 ` [PATCH 19/26] drm/i915: use new cursor in intel_prepare_plane_fb v2 Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-17 12:35 ` [PATCH 20/26] drm: use new iterator in drm_gem_fence_array_add_implicit v2 Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-17 14:53   ` Daniel Vetter
2021-09-17 14:53     ` [Intel-gfx] " Daniel Vetter
2021-09-20  7:31     ` Christian König
2021-09-20  7:31       ` [Intel-gfx] " Christian König
2021-09-17 12:35 ` [PATCH 21/26] drm: use new iterator in drm_gem_plane_helper_prepare_fb v2 Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-17 14:55   ` Daniel Vetter [this message]
2021-09-17 14:55     ` Daniel Vetter
2021-09-20  7:35     ` Christian König
2021-09-20  7:35       ` [Intel-gfx] " Christian König
2021-09-17 12:35 ` [PATCH 22/26] drm/nouveau: use the new iterator in nouveau_fence_sync Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-17 12:35 ` [PATCH 23/26] drm/nouveau: use the new interator in nv50_wndw_prepare_fb v2 Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-17 12:35 ` [PATCH 24/26] drm/etnaviv: use new iterator in etnaviv_gem_describe Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-17 12:35 ` [PATCH 25/26] drm/etnaviv: replace dma_resv_get_excl_unlocked Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-17 12:35 ` [PATCH 26/26] dma-buf: nuke dma_resv_get_excl_unlocked Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-17 14:56   ` Daniel Vetter
2021-09-17 14:56     ` [Intel-gfx] " Daniel Vetter
2021-09-17 14:01 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for series starting with [01/26] dma-buf: add dma_resv_for_each_fence_unlocked v2 Patchwork
2021-09-17 14:29 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork
2021-09-17 15:43 ` [Intel-gfx] ✗ Fi.CI.IGT: failure " Patchwork
  -- strict thread matches above, loose matches on Subject: below --
2021-09-16 11:30 Deploying new iterator interface for dma-buf Christian König
2021-09-16 11:30 ` [PATCH 21/26] drm: use new iterator in drm_gem_plane_helper_prepare_fb v2 Christian König

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